Question

A polythene piece rubbed with wool is found to have a charge of – 3.2×10⁻⁷C. Estimate the number of electrons transferred from which to which * (a) 2×10¹² from polythene to wool (b) 2×10¹² from wool to polythene (c) 51.2x 10²⁶ from wool to polythene (d) no electron transfer takes place​

Answer 1

Answer:

The right option is: (b) 2×10¹² from wool to polythene

Explanation:

• Charging by rubbing: When two materials are rubbed with each other then one material becomes positively charged and another one becomes negatively charged.
• In question the polythene piece is negatively charged because at the time of rubbing the electrons transfer from wool to the polythene.
• Calculation: Suppose 'n' electrons are transferred from wool to polythene.

       Charge of one electron = $- 1.6 \times 10^{-19}$ C.

      Charge of 'n' electrons = Charge of polythene

                  n($- 1.6 \times 10^{-19}$)   = – 3.2×10⁻⁷

                        n = $\frac{3.2\times10^{-7}}{1.6\times10^{-19}}$ = 2×10¹²

 ∴   2×10¹² electrons transferred from wool to polythene piece.

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